Random file generated to src/main/java instead of src/main/yang-gen-sal

In controller/opendaylight/mdsal/model/model-flow-base/

We get the generation of a single class to src/main/java instead of src/main/yang-gen-sal:

src/main/java//org/opendaylight/yang/gen/v1/urn/opendaylight/flow/types/port/rev130925/PortNumberBuilder.java

Oddly its package (with several other generated classes) is present in the correct directory:

src/main/yang-gen-sal/org/opendaylight/yang/gen/v1/urn/opendaylight/flow/types/port/rev130925/

This is both odd, and also creates the possibility of folks checking in generated code (as this is not excluded by the .gitignore.